Buggy code:
public static final char C_SEMICOLON = ';' ; public static final char C_COLON = ':' ; public static final char C_LONG = 'J' ; public static final char C_SHORT = 'S' ; public static final char C_VOID = 'V' ; public static final char C_TYPE_VARIABLE = 'T' ; public static final char C_STAR = '*' ; public static final char C_EXCEPTION_START = '^' ; public static final char C_EXTENDS = '+' ; public static final char C_SUPER = '-' ; public static final char C_DOT = '.' ; public static final char C_DOLLAR = '$' ; public static final char C_ARRAY = '[' ; public static final char C_RESOLVED = 'L' ; public static final char C_UNRESOLVED = 'Q' ; public static final char C_NAME_END = ';' ; public static final char C_PARAM_START = '(' ; public static final char C_PARAM_END = ')' ; public static final char C_GENERIC_START = '<' ; public static final char C_GENERIC_END = '>' ; public static final char C_CAPTURE = '!' ; public static final String SIG_BOOLEAN = "Z" ; public static final String SIG_BYTE = "B" ; public static final String SIG_CHAR = "C" ; public static final String SIG_DOUBLE = "D" ; public static final String SIG_FLOAT = "F" ; public static final String SIG_INT = "I" ; public static final String SIG_LONG = "J" ; public static final String SIG_SHORT = "S" ; public static final String SIG_VOID = "V" ; public static final int CLASS_TYPE_SIGNATURE = 1 ; public static final int BASE_TYPE_SIGNATURE = 2 ; public static final int TYPE_VARIABLE_SIGNATURE = 3 ; public static final int ARRAY_TYPE_SIGNATURE = 4 ; public static final int WILDCARD_TYPE_SIGNATURE = 5 ; public static final int CAPTURE_TYPE_SIGNATURE = 6 ; private static final char [ ] BOOLEAN = "boolean" . toCharArray ( ) ; private static final char [ ] BYTE = "byte" . toCharArray ( ) ; private static final char [ ] CHAR = "char" . toCharArray ( ) ; private static final char [ ] DOUBLE = "double" . toCharArray ( ) ; private static final char [ ] FLOAT = "float" . toCharArray ( ) ; private static final char [ ] INT = "int" . toCharArray ( ) ; private static final char [ ] LONG = "long" . toCharArray ( ) ; private static final char [ ] SHORT = "short" . toCharArray ( ) ; private static final char [ ] VOID = "void" . toCharArray ( ) ; private static final char [ ] EXTENDS = "extends" . toCharArray ( ) ; private static final char [ ] SUPER = "super" . toCharArray ( ) ; private static final char [ ] CAPTURE = "capture-of" . toCharArray ( ) ; private Signature ( ) { } private static int checkName ( char [ ] name , char [ ] typeName , int pos , int length ) { } public static char [ ] createArraySignature ( char [ ] typeSignature , int arrayCount ) { } public static String createArraySignature ( String typeSignature , int arrayCount ) { } public static char [ ] createMethodSignature ( char [ ] [ ] parameterTypes , char [ ] returnType ) { } public static String createMethodSignature ( String [ ] parameterTypes , String returnType ) { } public static char [ ] createTypeParameterSignature ( char [ ] typeParameterName , char [ ] [ ] boundSignatures ) { } public static String createTypeParameterSignature ( String typeParameterName , String [ ] boundSignatures ) { } public static String createTypeSignature ( char [ ] typeName , boolean isResolved ) { } public static char [ ] createCharArrayTypeSignature ( char [ ] typeName , boolean isResolved ) { } private static int consumeWhitespace ( char [ ] typeName , int pos , int length ) { while ( pos < length ) { char currentChar = typeName [ pos ] ; <START_BUG> if ( ( currentChar != '<seq2seq4repair_space>' ) && ( ! ( CharOperation . isWhitespace ( currentChar ) ) ) ) { <END_BUG> break ; } pos ++ ; } return pos ; } private static int encodeQualifiedName ( char [ ] typeName , int pos , int length , StringBuffer buffer ) { } private static int encodeArrayDimension ( char [ ] typeName , int pos , int length , StringBuffer buffer ) { } private static int checkArrayDimension ( char [ ] typeName , int pos , int length ) { } private static int checkNextChar ( char [ ] typeName , char expectedChar , int pos , int length , boolean isOptional ) { } private static int encodeTypeSignature ( char [ ] typeName , int start , boolean isResolved , int length , StringBuffer buffer ) { } public static String createTypeSignature ( String typeName , boolean isResolved ) { } public static int getArrayCount ( char [ ] typeSignature ) throws IllegalArgumentException { } public static int getArrayCount ( String typeSignature ) throws IllegalArgumentException { } public static char [ ] getElementType ( char [ ] typeSignature ) throws IllegalArgumentException { } public static String getElementType ( String typeSignature ) throws IllegalArgumentException { } public static int getParameterCount ( char [ ] methodSignature ) throws IllegalArgumentException { } public static int getTypeSignatureKind ( char [ ] typeSignature ) { } public static int getTypeSignatureKind ( String typeSignature ) { } public static int getParameterCount ( String methodSignature ) throws IllegalArgumentException { } public static char [ ] [ ] getParameterTypes ( char [ ] methodSignature ) throws IllegalArgumentException { } public static String [ ] getParameterTypes ( String methodSignature ) throws IllegalArgumentException { } public static String [ ] getThrownExceptionTypes ( String methodSignature ) throws IllegalArgumentException { } public static char [ ] [ ] getThrownExceptionTypes ( char [ ] methodSignature ) throws IllegalArgumentException { } public static char [ ] [ ] getTypeArguments ( char [ ] parameterizedTypeSignature ) throws IllegalArgumentException { } public static String [ ] getTypeArguments ( String parameterizedTypeSignature ) throws IllegalArgumentException { }

Fix:
if ( ( currentChar != '<seq2seq4repair_space>' ) && ( ! ( ScannerHelper . isWhitespace ( currentChar ) ) ) ) {